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This is an interesting project. It uses a laser pointer, a photocell and an inexpensive digital camera to create a system that will photograph anything that breaks the laser’s beam. You can use it as a straight-line system or add mirrors to create a perimeter. You could also attach it to something other than a camera. For example, if you add a solenoid valve and a 555 timer, it could turn on a sprinkler to scare rabbits or deer:
If you want something simpler, you can use a tripwire instead of a laser:
[[[See previous DIY - Build your own Mosquito Helicopter for $25,000]]]
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